The knowledge of switch cabinet can be better understood by mastering it

What is the difference between switch cabinet and power distribution cabinet?

Because the specific functions of the two may be different, they are called differently. Even if the design of the switch cabinet and the power distribution cabinet is similar from the appearance point of view, it does not include all. If it is internally used to control the "on" and "off" of the main power supply, and a large circuit breaker is also carried, we can call it a "switch cabinet" like this cabinet. If it mainly plays a role in the distribution of electric energy, then this kind of cabinet can be called a "distribution cabinet". There is also a case where the electric energy is divided into different functions and realized by different circuits. It can also be called a "distribution cabinet". cabinet".

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What does the low-voltage switchgear GGD, GCS, GCK, MNS mean?

◆GGD AC low-voltage power distribution cabinet: G-low-voltage power distribution cabinet; G-fixed installation and fixed wiring; D-power cabinet. The fixed wiring low-voltage power distribution cabinet developed in 1991 is divided into GGD1/GGD2/GGD3, with different breaking current capabilities.

◆GCK AC low-voltage power distribution cabinet: G-cabinet structure; C-drawable type; K-control center. Low-voltage withdrawable switchgear is suitable for power distribution and motor control. The main bus bar reaches 3150A and the vertical bus bar reaches 600A.

◆GCS AC low-voltage power distribution cabinet: G-closed switch cabinet; C-drawable type; S-Senyuan electrical system. The development in 1996 is similar to GCK, the main bus is 4000A and the vertical bus specification is 1000A, but it may be better than GCK in terms of performance.

◆MNS AC low-voltage power distribution cabinet: It is a draw-out switch cabinet, which is also used for power distribution or control. It is a device manufactured and produced based on the transfer of technology from ABB in Switzerland. The main bus bar reaches 5000A and the vertical bus bar standard is 1000A. If the double bus bar can reach 2000A, the performance is better than GCS.

GGD belongs to the old-fashioned domestic cabinet type. The installation method of its components is similar to that of the power box, and there is no divider in the middle of the circuit. The main feature of this type of switch cabinet is that each cabinet has a master isolating switch HD13BX, and at the same time it uses a frame of 8MF profile welding.

GCS is developed by the mechanical cabinet department of Senyuan Co., based on the reference to the MNS cabinet type. It also uses 8MF profile as the frame, and uses 20MM as a benchmark E and 160MM as a modulus, and the maximum current of the drawer can reach 400A. For specifications above 400A, a fixed split type is required. Drawer-type switch cabinets generally use side outlets, and the central position of the drawer is only equipped with a mechanical interlocking mechanism and operating handle connected together.

The cabinet type of MNS belonging to ABB is widely used in China. It is designed according to 25MM as a benchmark E and 8E or 200MM as a modulus. The maximum current of the drawer can reach 630A, and it is in the upper, right and lower corners of the drawer of the switch cabinet. There is a small handle and a large handle operating mechanism at the center.

Generally speaking, GCS is a drawer type, and GGD is a normal type. When the switch in the GCS switch cabinet is damaged, you can directly change the drawer and replace it without power failure. GGD requires a power failure. In terms of price, the GGD type is cheaper. The above are the more common types of switchgear, which can be replaced when the technical parameters can be met. Because GGD is a fixed wiring method, it is not suitable for places with high power supply reliability requirements.

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What is the difference between low voltage switch cabinet and low voltage power distribution cabinet?

The two devices have the same and different places, mainly depending on what role they play in the system. The same GGD type cabinet will be called "switch cabinet" by some people, and some people will call it "distribution cabinet". In fact, the specific name may be more appropriate if it is determined according to the installation location and internal wiring. In the industry, the low-voltage incoming and outgoing cabinets of low-voltage power distribution are often called switch cabinets, and the distribution rooms are distributed to other parts for installation. It is called the power distribution cabinet, even in this case, the external power distribution cabinet is designed as GGD or GCS type. In fact, it is better to understand the switch cabinets in the power distribution room as low-voltage switch cabinets (panels), and then call all the low-voltage power distribution cabinets (boxes) outside the power distribution room, because the scope of the switch cabinet is indeed too big.

What are the components of the low-voltage power distribution cabinet?

The equipment suitable for the power distribution room system is usually composed of cabinets, circuit breakers, fuses, contactors, indicator lights, meters, ammeters, as well as voltmeters, power capacitors, current-limiting reactance, control buttons, and power factor controllers , Busbar and other electrical instrument components.

If it is only a power cabinet or a lighting cabinet, its structure is much simpler, including circuit breakers, leakage protectors, indicator lights, meters, ammeters, voltmeters, etc.

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Classification of low, medium and high voltage switchgear voltage levels

The domestic voltage levels are basically divided into 220V, 380V, 10kV, 24kV, 35kV, 110kV, 220kV, 500kV, 800kV, 1000kV, and the specific division methods are as follows.

◆Low voltage: less than 400V;

◆Medium voltage: 10 to 35kV;

◆High voltage: above 110kV to below 500kV;

◆Ultra high voltage: 500kV and above.

The low-voltage switchgear is mainly 380V low-voltage switchgear, which implements the standard GB7251.

High-voltage switch cabinets are mainly 12kV, 24kV, and 40.5kV, but according to the actual voltage level, this type of specification should be called "medium voltage switchgear", and the implementation standard requires GB3906-2006.

How to distinguish low-voltage switchgear and high-voltage switchgear?

It can be judged by the following two aspects:

1. The first is through the size of the shape and volume. Normally, the high pressure is larger, but this is not absolute, and some low pressures will be larger or the same than the high pressure.

2.The second is a relatively reliable and correct method, which is distinguished by the technical parameters of the nameplate on the equipment. Generally, the rated voltage of low-voltage switchgear is 220/380V, and the minimum high-voltage switchgear must be 6kV, which can also be called medium voltage.

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What are the five defenses of the switch cabinet?

◆Five preventions: usually refers to the "five preventions" of the high-voltage switchgear or the "five preventions and one pass" of the substation room.

◆The details of the five preventions of high-voltage switchgear are as follows:

1. Prevent the disconnecting switch with load, (that is, the disconnecting switch cannot be operated when the circuit breaker, load switch and contactor are in the closed state)

2. Prevent mis-opening and mis-closing of circuit breakers, load switches, and contactors (only when the operating instructions correspond to the operating equipment can the operated equipment be operated).

3. Prevent the circuit breaker and load switch from being closed when the grounding switch is in the closed position. (Only when the grounding switch is in the open state, can the isolating switch or the switch cabinet handcart enter the working position and operate the circuit breaker Switch and load switch closing action).

4. Prevent the grounding switch from being turned on by mistake when it is energized. (Only when the circuit breaker is in the open state can the isolation switch of the switch cabinet be operated or the handcart can be retracted from the working position to the test position and the grounding switch can be closed) .

5. Prevent entering the charged compartment by mistake, (only when the compartment is not charged, can you open the door to enter the compartment).

◆The five protections and one pass of the power distribution room are: fireproof, waterproof, snowproof, lightning protection, small animal protection, and good ventilation.okplazas.com Electromechanical Mall is a professional agent selling switchgear products. Welcome to email: [email protected] for consultation, and you can also contact WeChat customer service +86-13689242098 online for product consultation!